• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권2호
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• pp.663-677
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• 2023

As the paradigm of future vehicles changes, the interest in automotive semiconductor, which plays a key role in realizing this, is increasing. Automotive semiconductors are the technology with very high entry barriers that require a lot of effort and time because it must secure technology readiness level and also consider safety and reliability. In this technology field, it is very important to develop new businesses and create opportunities through technology trend analysis. However, systematic analysis and application of automotive semiconductor technology trends are currently lacking. In this paper, U.S. registered patent documents related to automotive semiconductor were collected and investigated based on the patent's IPC. The main technology of automotive semiconductor was analyzed through topic modeling, and the technology path such as emerging technology was investigated through cosine similarity. We identified that those emerging technologies such as driving control for vehicle and AI service appeared. We observed that as time passed, both convergence and independence of automotive semiconductor technology proceeded simultaneously.

• 한국운동역학회지
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• 제20권2호
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• pp.149-154
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• 2010

Intentional draw and fade shots could be good weapons for lowering golf score. But how to make such shots? To investigate deterministic variables generating different projectile paths of shots in square stance was the purpose of this study. Ten right-handed male collegiate athletes, showing 1.3 of averaged handicap, participated in this study. They were asked to intentionally perform three different shots such as the straight shot(control condition), draw shot, and fade shot. Swing path, pelvis rotation angle, thorax rotation angle and left forearm supination angle were determined for dependent variables on impact event at each trial. For statistical analysis one-way repeated measures ANOVA were used. The results showed that swing path was one of main factor making differences among three kind of shots. Straight shot vs. Draw shot, Straight shot vs. Fade shot and Draw shot vs. Fade shot showed differences on swing path. And left forearm supination angle revealed significant difference between draw shot and fade shot, showing a significant larger angle of draw shot than fade shot. No other significant difference was detected for the other variables. We found that the shot characteristics were influenced primarily by swing path and left forearm supination angle.

• 지질공학
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• 제34권2호
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• pp.207-216
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• 2024

이 연구는 울릉도 나리분지 추산용천수의 유동 경로를 파악하는 것이다. 칼데라 내부 가장자리를 따라 발달하는 단층과 단열구조들의 발달 방향이 추산용천수 유동 경로에 영향을 주는 요소로 파악되었다. 추산용천수는 함양된 지하수가 동서 방향과 남북 방향의 단열대를 따라 추산용출소 방향으로 흐른다. 이와 더불어 북북동 방향으로 경사진 칼데라의 부등함몰의 영향으로 북동 내지 북북동 방향으로 흐르는 것으로 파악되었다. 장내세균과인 Entrobacteriaceae을 이용하여 나리지하수 쪽의 물이 추산용출소 방향으로 유동하는 것으로 파악되었다. 다만, 분석에 사용된 시료수가 매우 적어 성인계곡수로부터 나리분지와 추산용출소까지의 유동경로를 전체적으로 파악할 수 없다는 제한성이 있다.

• 한국사회복지학
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• 제65권2호
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• pp.231-254
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• 2013

불법도박의 확산은 물론 도박의 합법화 및 사행산업 규모의 증가로 인해 우리 국민의 도박에의 접근성은 매우 용이하다. 실제로 한국인의 문제도박율은 높은 수준이며, 도박으로 인한 개인적, 가족적, 사회경제적 폐해 또한 심각하다. 선행연구에서는 심리사회적 발달단계의 특성 등으로 인해 대학생 집단이 청소년과 성인에 비해 도박참여 및 문제도박율이 높다고 보고한다. 본 연구에서는 대학생의 문제도박 발달경로를 탐색하려는 목적으로 Jacob의 중독의 일반이론을 적용하여 연구모형을 설정한 후, 변인간의 관계를 구조방정식 방법으로 분석하였다. 연구대상자는 전국 5개 권역에서 조사한 대학생 870명 중 도박경험이 있다고 응답한 남학생 366명이었다. 주요 발견으로는 첫째, 남자 대학생의 문제도 박률은 14%로 나타나 동일척도를 사용한 기존 연구와 유사하거나 더 높았다. 둘째, 구조분석 결과 남자 대학생의 심리적 취약성은 현재 상태에서 벗어나고자 하는 탈출욕구를 증진시켜 문제도박을 초래하는 경로가 유의미한 반면, 신체적 취약성이 탈출욕구를 통해 문제도박에 이르는 경로는 유의미하지 않았다. 연구결과를 바탕으로 대학생 문제도박의 예방 및 치유재활과 관련된 사회복지 개입전략이 논의 되었다.

• 항공우주시스템공학회지
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• 제13권4호
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• pp.50-59
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• 2019

플랩제어시스템의 주요 구성품인 주제어밸브의 설계는 실제 제작 경험을 바탕으로 반복-오차 방법에 의존하여 수행하였다. 본 논문에서는 모델 기반의 부품 설계 방법을 제안하였다. 플랩제어시스템은 주제어 밸브, 고장-안전 밸브, 솔레노이드 밸브, LVDT, 구동 모터 등으로 구성된다. 주제어밸브는 주로 스풀과 슬롯으로 구성된다. 주제어밸브의 중요한 설계변수는 슬롯의 폭 (Slot Width), 오버 랩(Overlap) 및 간극(Clearance)이다. AMESim을 활용하여 주 제어 밸브의 유로를 모델링하고 해석하였다. 제안된 설계절차를 적용한 결과 허용된 가공오차 범위 내에서 요구 성능을 충족함을 확인하였다.

• 융합정보논문지
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• 제8권4호
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• pp.99-108
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• 2018

이 연구는 승마참여자들의 향유하기, 정서 및 행복감연구로서 주요 모집단은 232명의 승마에 참여하고 있는 여가스포츠 참여자들이다. 본 연구의 주요 결과를 도출하기 위하여 첫째, 주요 변수의 요인 추출 및 타당도 검증을 위해 탐색적 요인분석, 그 결과를 바탕으로 확인적 요인분석을 실시하였다. 둘째, 주요 변수 간의 상관을 알아보기 위하여 상관관계 분석을 실시하였으며, 셋째, 본 연구의 최종 결과를 도출하기 위하여 경로분석을 수행하였다. 이외에 주요 측정도구에 대한 신뢰도 분석을 실시하여 내적 일치도(Conbach's ${\alpha}$)를 알아보았다. 이상의 분석은 IBM SPSS 21.0 프로그램과 IBM AMOS 21.0 프로그램을 활용하였다. 이 연구는 승마참여자들의 향유하기와 정서, 그리고 행복감의 인과적 관계를 살펴보았으며, 주요 결과는 다음과 같다. 첫째, 승마참여자들의 향유하기가 정서에 미치는 영향을 살펴본 결과, 과거회상은 부정적 정서에 통계적으로 유의한 부적 영향을 미쳤고, 미래기대는 긍정적 정서에 통계적으로 유의한 부적 영향을 미치는 것으로 나타났다. 둘째, 승마참여자들의 향유하기가 행복감에 미치는 영향을 살펴본 결과, 미래기대는 행복감에 통계적으로 유의한 정적 영향을 미치는 것으로 나타났다. 셋째, 승마참여자들의 정서가 행복감에 미치는 영향을 살펴본 결과, 긍정적 정서는 행복감에 통계적으로 유의한 정적 영향을 미치는 것으로 나타났다.

• 한국생활과학회지
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• 제7권1호
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• pp.85-95
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• 1998

The main purpose of this study was to investigate the relationship between financial management behavior and subjective level of consumption of rural households. In this study, financial management behavior was defined to include 'budgeting' and 'expenditure management'. Data were collected from the 215 rural households in 13 different provinces of Chungnam, and 203 households were used for the analysis. Frequency distribution, means, and path analysis were employed for the statistical analysis. Major findings were as follows. Budgeting behavior had a significant positive effect on rural households' subjective level of consumption, while expenditure management behavior didn't have any significant effect. This implies that active and systematic financial management behavior such as budgeting is more effective than relatively passive financial management behavior like expenditure management on the enhancement of economic well-being of rural households. Age, education, and number of non-farm earners had indirect effects on the subjective level of consumption through budgeting behavior. Income stability had a direct effect and income had both direct and indirect effects on the subjective level of consumption.

• Structural Engineering and Mechanics
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• 제39권6호
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• pp.877-893
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• 2011

Response spectra of earthquake ground motions are important in the earthquake-resistant design and reliability analysis of structures. The formulation of the response spectrum in the frequency domain efficiently computes and evaluates the stochastic response spectrum. The frequency information of the excitation can be described using different functional forms. The shapes of the calculated response spectra of the excitation show strong magnitude and site dependency, but weak distance dependency. In this paper, to compare the effect of the earthquake ground motion variables, the contribution of these sources of variability to the response spectrum's uncertainty is calculated by using a stochastic analysis. The analytical results show that earthquake source factors and soil condition variables are the main sources of uncertainty in the response spectra, while path variables, such as distance, anelastic attenuation and upper crust attenuation, have relatively little effect. The presented formulation of dynamic structural response in frequency domain based only on the frequency information of the excitation can provide an important basis for the structural analysis in some location that lacks strong motion records.

• Corrosion Science and Technology
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• 제12권5호
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• pp.227-232
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• 2013

A number of components installed in the secondary system of nuclear power plants are exposed to aging mechanisms such as FAC (Flow-Accelerated Corrosion), Cavitation, Flashing, and LDIE (Liquid Droplet Impingement Erosion). Those aging mechanisms can lead to thinning of the components. In April 2013, one (1) inch small bore piping branched from the main steam line experienced leakage resulting from wall thinning in a 1,000 MWe Korean PWR nuclear power plant. During the normal operation, extracted steam from the main steam line goes to condenser through the small bore piping. The leak occurred in the downstream of an orifice. A control valve with vertical flow path was placed on in front of the orifice. This paper deals with UT (Ultrasonic Test) thickness data, SEM images, and numerical simulation results in order to analyze the extent of damage and the cause of leakage in the small bore piping. As a result, it is concluded that the main cause of the small bore pipe wall thinning is liquid droplet impingement erosion. Moreover, it is observed that the leak occurred at the reattachment point of the vortex flow in the downstream side of the orifice.

• 한국생활과학회지
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• 제7권2호
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• pp.1-10
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• 1998

The purpose of this study are to examine the influential variables between general character, family system, coping strategies, social support and stress of main caregivers for disordered elderly family. This study was conducted by interviewing of 177 family-members care to giving disordered elderly families in Taegu and Kyeongbuk province. The data were analyzed with the SPSS statistical package using frequency and percentage, multiple regression and path analysis. The results of this study were as follow : The variables influencing stress related to the disordered elderly family are the degree of disorder (${\beta}=.348^{***}$), caring-time-per day (${\beta}=.303^{***}$), employment status of main caregivers (${\beta}=.223^{***}$), social support (${\beta}=.241^{**}$), relational coping strategies (${\beta}=.199^{**}$), problem-avoidance coping strategies (${\beta}=.327^{***}$). Thus, in disordered elderly families, a high-stress situation arises with a highly-educated caregiver when problem-avoidence coping strategies or relational coping strategies are used or when daily caring time is great. A low-stress situation results when the caregiver is employed and the social support level is high.